Method for operating an electric island power network

A method for operating an electric island power network (10) having at least one energy generation plant (11, 12) based on renewable energy sources, at least one energy generation plant (13) based on conventional energy sources, at least one energy store (14) and at least one energy consumer (15, 16), the method comprising:

• defining first operating parameters (25) for the island power network (10) in an event-controlled manner in a case in which a frequency of the island power network (10) and/or a voltage of the island power network (10) is outside defined limits, the first operating parameters (25) being defined such that operating the island power network (10) under the first operating parameters (25) causes the frequency of the island power network (10) and the voltage of the island power network (10) to both be within the defined limits;
• defining second operating parameters (30) for the island power network (10) in a time-controlled manner after the expiration of a defined time span over which the frequency of the island power network (10) and the voltage of the island power network (10) have remained within the defined limits, the second operating parameters (30) being defined such that operating the island power network (10) under the second operating parameters (30) causing the island power network (10) to operate such that the island power network (10) is cost-optimally operated;
• verifying, following the definition of the second operating parameters (30) for the cost-optimal operation of the island power network (10), as to whether the second operating parameters (30) ensure that the frequency of the island power network (10) and the voltage of the island power network (10) are still within the defined limits;
• maintaining operation of the island power network (10) based on the second operating parameters (30) if it is verified that the frequency of the island power network (10) and the voltage of the island power network (10) are still within the defined limits;
• and
• discontinuing operation based on the second operating parameters (30) of the island power network (10) if the frequency of the island power network (10) and the voltage of the island power network (10) are outside of the defined limits such that the island power network (10) is not cost-optimally operated.